John Deere 1859.19 – SCC (Rear Chassis Module) or SCU (Steering/Chassis Control Unit): Radar Message Reporting an Error / Radar Not Available

The control module is not receiving a valid ground speed signal from the dual-beam radar sensor over the CAN BUS network.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 9470RT
• 9520RT
• 9570RT
• 9230
• 9330
• 9430
• 9530
• 9630
• 6R series
• 7R series
• 8R series
• 8RT series
• 8RX series
• 9R series
• 9RX series

1. 1

   Inspect the radar sensor (typically mounted under the cab or chassis) to ensure the dual-beam emission horns and shield are not blocked by heavy mud, crop debris, or ice.

2. 2

   Check the wiring harness and connector at the radar sensor for corrosion, moisture intrusion, or loose pins.

3. 3

   Inspect the CAN BUS wiring between the radar sensor and the SCC/SCU module for chafing or breaks.

4. 4

   Attempt a recalibration before replacing parts, as the radar may have lost its calibration due to a voltage drop or software glitch.

1. 1

   Disconnect battery

   Disconnect the negative battery terminal.

2. 2

   Unplug harness

   Unplug the wiring harness from the faulty radar sensor.

3. 3

   Remove sensor

   Unbolt the sensor from its mounting bracket and remove the shield.

4. 4

   Install new sensor

   Install the new radar sensor and torque the mounting hardware to OEM specifications. Reconnect the harness.

5. 5

   Prepare for calibration

   Ensure the tractor is unladen (no load) and parked on a hard, level, dry surface. Note: Manual calibration must not be performed on John Deere dual-beam radars; use the automatic calibration feature.

6. 6

   Access calibration menu

   Access the CommandCenter™ display and press the Menu button. Navigate to Performance Monitor → Performance Monitor Settings → Calibrate Radar.

7. 7

   Activate radar

   Check the box for John Deere™ Dual-Beam Radar Activated.

8. 8

   Drive and confirm

   Drive the tractor in a straight line at approximately 2 mph (3.2 km/h) to 5 mph (8 km/h) and press the confirm button.

9. 9

   Stop and verify

   Stop the tractor when the display prompts you. The screen will show if the calibration was successful. Note: If calibration fails on three successive attempts, there may be a mounting angle issue or a secondary CAN BUS fault.